Find    the simple interest on Rs. 625 from March 2, 1982 to October 7, 1982 at 5% S.I.

To calculate the simple interest, we use the formula:

\[
\text{Simple Interest} = \frac{P \times R \times T}{100}
\]

where:
- \(P\) is the principal amount (Rs. 625),
- \(R\) is the rate of interest (5%),
- \(T\) is the time in years (calculated between March 2, 1982, and October 7, 1982).

### Step 1: Calculate the time \(T\)
We need to calculate the time between March 2, 1982, and October 7, 1982. This involves counting the total days.

- From March 2 to March 31: 29 days
- April: 30 days
- May: 31 days
- June: 30 days
- July: 31 days
- August: 31 days
- September: 30 days
- From October 1 to October 7: 7 days

Total number of days = \(29 + 30 + 31 + 30 + 31 + 31 + 30 + 7 = 219\) days.

Convert days to years:
\[
T = \frac{219}{365} \approx 0.6 \text{ years}
\]

### Step 2: Substitute values into the formula

Now substitute the values into the simple interest formula:
\[
\text{Simple Interest} = \frac{625 \times 5 \times 0.6}{100} = \frac{1875}{100} = 18.75
\]

Thus, the simple interest is **Rs. 18.75**.

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Would you like a detailed breakdown of the steps? Here are some related questions for practice:

1. What would the interest be for Rs. 1000 at the same rate and duration?
2. How would the interest change if the duration was 1 full year?
3. How do you calculate compound interest over the same period?
4. What would be the interest rate if the interest were Rs. 30?
5. How does the length of time affect the simple interest?

**Tip:** When working with time in interest calculations, always convert the days into years by dividing by 365.

Find the simple interest on Rs. 625 from March 2, 1982 to October 7, 1982 at 5% S.I.

Learn how to calculate the simple interest on Rs. 625 at a 5% interest rate from March 2, 1982, to October 7, 1982. This detailed solution covers the key steps for calculating time in years and applying the simple interest formula. Suitable for Grades 6-8 students learning basic interest calculation.

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